﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace teach
{
    public interface IOperation
    {
        int First { get; set; }
        int Second { get; set; }
        int OperationAnswer { get; set; }
        string Sign { get;}

        int EmptyField { get; set; }
    }
}
